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PATENTS | 9 Months Ended
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Jun. 30, 2021
PATENTS |
G. PATENTS | G. PATENTS During the nine months ended June 30, 2021 and 2020, no patent impairment charges were recorded. For the nine months ended June 30, 2021 and 2020, amortization of patent costs totaled approximately $39,000 and $40,000, respectively. For the three months ended June 30, 2021 and 2020, amortization of patent costs totaled approximately $13,000 and $14,000, respectively. Approximate estimated future amortization expense is as follows:
Three months ending September 30, 2021 |  | $ | 13,000 |
Year ending September 30, |  |  |  |
2022 |  |  | 48,000 |
2023 |  |  | 38,000 |
2024 |  |  | 31,000 |
2025 |  |  | 28,000 |
2026 |  |  | 24,000 |
Thereafter |  |  | 97,000 |
Total |  | $ | 279,000 |

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